Can't open a file in blender 2.79
In general, when you save or create something in a newer version of a software then you can't open it in older ones. If you want to keep working your file in 2.79 try opening that version of the program and on the top left corner go to File&gt;Recover&gt;Auto Save... I'm using 2.90 though but I hope that's the same in 2.79 as well.